<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta
      name="description"
      content="Draw lines and polygons on terrain with mouse clicks."
    />
    <meta name="cesium-sandcastle-labels" content="Showcases" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body
    class="sandcastle-loading"
    data-sandcastle-bucket="bucket-requirejs.html"
  >
    <style>
      @import url(../templates/bucket.css);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar">
      <table class="infoPanel">
        <tbody>
          <tr>
            <td>Left click to add a vertex.</td>
          </tr>
          <tr>
            <td>Right click to start new shape.</td>
          </tr>
        </tbody>
      </table>
    </div>
    <script id="cesium_sandcastle_script">
      window.startup = async function (Cesium) {
        "use strict";
        //Sandcastle_Begin
        const viewer = new Cesium.Viewer("cesiumContainer", {
          selectionIndicator: false,
          infoBox: false,
          terrain: Cesium.Terrain.fromWorldTerrain(),
        });

        viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(
          Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK
        );
        function createPoint(worldPosition) {
          const point = viewer.entities.add({
            position: worldPosition,
            point: {
              color: Cesium.Color.WHITE,
              pixelSize: 5,
              heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
            },
          });
          return point;
        }
        let drawingMode = "line";
        function drawShape(positionData) {
          let shape;
          if (drawingMode === "line") {
            shape = viewer.entities.add({
              polyline: {
                positions: positionData,
                clampToGround: true,
                width: 3,
              },
            });
          } else if (drawingMode === "polygon") {
            shape = viewer.entities.add({
              polygon: {
                hierarchy: positionData,
                material: new Cesium.ColorMaterialProperty(
                  Cesium.Color.WHITE.withAlpha(0.7)
                ),
              },
            });
          }
          return shape;
        }
        let activeShapePoints = [];
        let activeShape;
        let floatingPoint;
        const handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas);
        handler.setInputAction(function (event) {
          // We use `viewer.scene.globe.pick here instead of `viewer.camera.pickEllipsoid` so that
          // we get the correct point when mousing over terrain.
          const ray = viewer.camera.getPickRay(event.position);
          const earthPosition = viewer.scene.globe.pick(ray, viewer.scene);
          // `earthPosition` will be undefined if our mouse is not over the globe.
          if (Cesium.defined(earthPosition)) {
            if (activeShapePoints.length === 0) {
              floatingPoint = createPoint(earthPosition);
              activeShapePoints.push(earthPosition);
              const dynamicPositions = new Cesium.CallbackProperty(function () {
                if (drawingMode === "polygon") {
                  return new Cesium.PolygonHierarchy(activeShapePoints);
                }
                return activeShapePoints;
              }, false);
              activeShape = drawShape(dynamicPositions);
            }
            activeShapePoints.push(earthPosition);
            createPoint(earthPosition);
          }
        }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

        handler.setInputAction(function (event) {
          if (Cesium.defined(floatingPoint)) {
            const ray = viewer.camera.getPickRay(event.endPosition);
            const newPosition = viewer.scene.globe.pick(ray, viewer.scene);
            if (Cesium.defined(newPosition)) {
              floatingPoint.position.setValue(newPosition);
              activeShapePoints.pop();
              activeShapePoints.push(newPosition);
            }
          }
        }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
        // Redraw the shape so it's not dynamic and remove the dynamic shape.
        function terminateShape() {
          activeShapePoints.pop();
          drawShape(activeShapePoints);
          viewer.entities.remove(floatingPoint);
          viewer.entities.remove(activeShape);
          floatingPoint = undefined;
          activeShape = undefined;
          activeShapePoints = [];
        }
        handler.setInputAction(function (event) {
          terminateShape();
        }, Cesium.ScreenSpaceEventType.RIGHT_CLICK);

        const options = [
          {
            text: "Draw Lines",
            onselect: function () {
              if (!Cesium.Entity.supportsPolylinesOnTerrain(viewer.scene)) {
                window.alert(
                  "This browser does not support polylines on terrain."
                );
              }

              terminateShape();
              drawingMode = "line";
            },
          },
          {
            text: "Draw Polygons",
            onselect: function () {
              terminateShape();
              drawingMode = "polygon";
            },
          },
        ];

        Sandcastle.addToolbarMenu(options);
        // Zoom in to an area with mountains
        viewer.camera.lookAt(
          Cesium.Cartesian3.fromDegrees(-122.2058, 46.1955, 1000.0),
          new Cesium.Cartesian3(5000.0, 5000.0, 5000.0)
        );
        viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
        //Sandcastle_End
      };
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        window.startup(Cesium).catch((error) => {
          "use strict";
          console.error(error);
        });
        Sandcastle.finishedLoading();
      }
    </script>
  </body>
</html>
